EP3630345A1 - Autoclave system and method - Google Patents

Autoclave system and method

Info

Publication number
EP3630345A1
EP3630345A1 EP18735371.9A EP18735371A EP3630345A1 EP 3630345 A1 EP3630345 A1 EP 3630345A1 EP 18735371 A EP18735371 A EP 18735371A EP 3630345 A1 EP3630345 A1 EP 3630345A1
Authority
EP
European Patent Office
Prior art keywords
fluid
heat exchanger
conduit
leaching
autoclave
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18735371.9A
Other languages
German (de)
French (fr)
Other versions
EP3630345B1 (en
Inventor
Howard PICKARD
Kyle PICKLES
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Leeds And Bradford Boiler Co Ltd
Original Assignee
Leeds And Bradford Boiler Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Leeds And Bradford Boiler Co Ltd filed Critical Leeds And Bradford Boiler Co Ltd
Publication of EP3630345A1 publication Critical patent/EP3630345A1/en
Application granted granted Critical
Publication of EP3630345B1 publication Critical patent/EP3630345B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
    • B01J3/04—Pressure vessels, e.g. autoclaves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
    • B01J3/002—Component parts of these vessels not mentioned in B01J3/004, B01J3/006, B01J3/02 - B01J3/08; Measures taken in conjunction with the process to be carried out, e.g. safety measures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
    • B01J3/02—Feed or outlet devices therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
    • B01J3/04—Pressure vessels, e.g. autoclaves
    • B01J3/042—Pressure vessels, e.g. autoclaves in the form of a tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
    • B01J3/04—Pressure vessels, e.g. autoclaves
    • B01J3/044—Pressure vessels, e.g. autoclaves in the form of a loop
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
    • B01J3/04—Pressure vessels, e.g. autoclaves
    • B01J3/046—Pressure-balanced vessels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
    • B22D29/001—Removing cores
    • B22D29/002—Removing cores by leaching, washing or dissolving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/0066—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00051—Controlling the temperature
    • B01J2219/00074—Controlling the temperature by indirect heating or cooling employing heat exchange fluids
    • B01J2219/00076—Controlling the temperature by indirect heating or cooling employing heat exchange fluids with heat exchange elements inside the reactor
    • B01J2219/00083—Coils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00051—Controlling the temperature
    • B01J2219/00074—Controlling the temperature by indirect heating or cooling employing heat exchange fluids
    • B01J2219/00087—Controlling the temperature by indirect heating or cooling employing heat exchange fluids with heat exchange elements outside the reactor
    • B01J2219/0009—Coils
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/0206—Heat exchangers immersed in a large body of liquid
    • F28D1/0213—Heat exchangers immersed in a large body of liquid for heating or cooling a liquid in a tank
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/0233—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with air flow channels
    • F28D1/024—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with air flow channels with an air driving element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
    • F28D7/024—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled the conduits of only one medium being helically coiled tubes, the coils having a cylindrical configuration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to an autoclave system and to a method of operating an autoclave system, and is concerned particularly, though not exclusively, with a leaching autoclave system and a method of operating the same .
  • An autoclave is a pressure vessel used in various processes usually requiring the applications of high pressures and/or temperatures to treat physically, and/or chemically, an article such as a component, instrument or workpiece .
  • the operation of the autoclave is to cause the dissolution or degradation of sacrificial ceramic structures, known as cores, used in the precision casting of fine components, such as turbine parts for aviation engines, where these cannot be removed from the finished component intact.
  • the component is placed inside an autoclave vessel and a solution that is destructive (usually caustic) to the ceramic core is introduced.
  • a solution that is destructive usually caustic
  • the caustic solution inside the autoclave is made to boil violently, and thus to agitate, and ultimately dissolve, the ceramic core, in a process known as "leaching".
  • the caustic solution is then discharged to a supply tank so that the component can be removed from the autoclave, before repeating the cycle with a new component, using solution from the tank.
  • Gas such as nitrogen or air, is used selectively pressurize the vessel, so as to control the boiling of the leaching solution therein. This is sometimes referred to as the pressurizing or venting gas.
  • Figure 1 shows schematically, generally at 100, a leaching autoclave system, in which an autoclave vessel
  • First and second discharge pipes 130 and 140 respectively convey vented gas and/or vapour and used leaching fluid from the autoclave vessel 110 to the tank 120, at the end of a leaching cycle.
  • a charging pipe 150 conveys leaching fluid from the tank 120 to the vessel 110 in preparation for the next leaching cycle.
  • Both the extracted leaching liquid and the vented gas are typically returned to a storage vessel which contains a reservoir volume of the leaching fluid at a lower temperature and pressure.
  • a storage vessel which contains a reservoir volume of the leaching fluid at a lower temperature and pressure.
  • the returning fluids are introduced into the tank, sometimes through a pressure- dissipating pipe - known as a "sparge pipe", their energy reduces.
  • the temperature of the reservoir increases. After a number of cycles, the temperature reaches a level at which a hazard risk is presented.
  • Embodiments of the present invention aim to address at least partly the aforementioned problems.
  • a heat exchanger for use with an autoclave vessel arranged in use to communicate fluidically with an external support system, the heat exchanger being arranged in use to be located in a fluid flow path between the autoclave vessel and the external support system, and to be fluidically connected to each, the heat exchanger comprising a body and a thermal exchange conduit located within the body arranged in use to convey fluid between the autoclave vessel and the support system, the body being arranged in use to contain a thermal exchange medium for at least partly surrounding the conduit so as to facilitate the transfer of heat energy between fluid in the conduit and the thermal exchange medium outside the conduit in use, wherein a leaching fluid and a pressurizing/venting fluid are arranged to be separately conveyed between the autoclave vessel and the external support system, and at least one of the leaching fluid and the pressurizing/venting fluid is conveyed through the thermal exchange conduit.
  • the conduit is arranged in use to convey leaching fluid for use in a leaching operation in an autoclave vessel.
  • the conduit is arranged in use to convey venting fluid from an autoclave vessel.
  • the conduit may comprise a first conduit pathway arranged in use to convey leaching fluid between an autoclave vessel and an external support system.
  • the conduit may comprise a second conduit pathway arranged in use to convey venting fluid from an autoclave vessel to an external support system.
  • the conduit comprises first and second conduit pathways.
  • the first conduit pathway is preferably arranged in use to convey leaching fluid discharged from an autoclave vessel to an external support system, and may convey leaching fluid from an external support system to an autoclave vessel.
  • the heat exchanger may comprise a heater for heating the leaching fluid prior to charging of an autoclave vessel, either directly or indirectly via the thermal exchange medium.
  • the external support system may comprise a supply of fluid and/or an outlet for discharged fluid.
  • the external support system comprises a storage tank for storing fluid.
  • the body is preferably constructed so as to withstand super-atmospheric pressure.
  • the body comprises valving to allow control of the thermal transfer medium into and/or out of the body.
  • the body is arranged in use to contain a thermal transfer medium in the form of a liquid.
  • the thermal transfer medium may comprise water, and more preferably may comprise liquid water.
  • the first conduit pathway and/or the second conduit pathway comprise one or more tubes.
  • The, or each tube may be substantially helical.
  • the or each tube may be in thermal contact with the exchange medium, and more preferably may be at least partly or substantially surrounded by, and/or at least partly or substantially immersed in, the exchange medium.
  • the invention also includes a leaching autoclave system comprising a heat exchanger according to any statement herein.
  • the system may comprise an autoclave vessel and may comprise an external support system which may include a storage tank, with one or both of the vessel and support system being arranged in fluidic communication with the heat exchanger, which is located separately.
  • a method of operating a leaching autoclave system comprising discharging fluid from an autoclave vessel to an external support system through a heat exchanger to reduce the temperature of the fluid, wherein the method comprises conveying separately a leaching fluid and a pressurizing/venting fluid from the autoclave vessel to the external support system, at least one of the leaching fluid and the pressurizing/venting fluid being conveyed through a thermal exchange conduit of the heat exchanger.
  • the method may comprise passing the discharge fluid through the conduit of the heat exchanger, which conduit is in thermal contact with a thermal transfer medium.
  • the method may comprise passing a first component of discharging fluid through a first conduit pathway to reduce the temperature of the first component, the first component comprising a leaching fluid.
  • the method may comprise passing a second component of discharging fluid through a second conduit pathway to reduce the temperature of the second component, the second component comprising pressurizing/venting fluid.
  • the first component of fluid may comprise a liguid component and the second component may comprise a gaseous component.
  • the method may comprise heating a leaching fluid in the heat exchanger prior to charging an autoclave vessel for a leaching operation.
  • the method may comprise heating the leaching fluid by heating a thermal exchange medium of the heat exchanger.
  • the method includes charging and discharging the autoclave with leaching fluid through the same conduit, more preferably the same conduit pathway, in the heat exchanger.
  • the invention may include any combination of the features or limitations referred to herein, except such a combination of features as are mutually exclusive, or mutually inconsistent.
  • Figure 1 shows schematically a previously considered leaching autoclave system
  • Figure 2 shows schematically a leaching autoclave system according to an embodiment of the present invention
  • Figures 3a to 3d show, respectively: in perspective view, in perspective view with a body removed, in sectional view, and in part-cutaway perspective view from above, a heat exchanger for use in the system according to Figure 2; and Figure 4 shows schematically a leaching autoclave system in accordance with another embodiment of the present invention .
  • FIG. 2 shows generally at 200 an autoclave system according to an embodiment of the present invention.
  • the system comprises an autoclave vessel 210, for performing a leaching operation on sacrificial ceramic cores (not shown) and a storage vessel 220 for containing caustic leaching fluid 230.
  • a heat exchange unit 240 Interposed in a fluid flow path between the vessel 210 and the tank 220 is a heat exchange unit 240.
  • the heat exchange unit 240 comprises a body 250 containing a thermal exchange medium, in the form of water 260, and first and second thermal exchange conduits represented at 270 and 280.
  • a thermal exchange medium inlet pipe 290a and a thermal exchange medium outlet pipe 290b are provided to the body so that the medium 260 can be replenished, preferably substantially continuously, to optimize thermal transfer efficiency.
  • Pipe PI conveys venting gas from the autoclave vessel 210 to the heat exchanger 240.
  • the venting gas is cooled, and its pressure reduced, in the heat exchanger before being conveyed to the tank 220 by pipe P2.
  • Used leaching fluid is discharged from the vessel 210 to the heat exchanger via pipe P3 r where it is cooled and its pressure reduced before being returned to the tank 220 via pipe P4, at the end of a leaching cycle.
  • the leaching or caustic fluid may typically comprise a base liquid such as an aqueous solution of a hydroxide, more typically sodium or potassium hydroxide.
  • a further pipe, P5 conveys leaching fluid from the tank to charge the vessel 210 for the next leaching cycle.
  • the unit 240 comprises a substantially cylindrical body 300 of 316 Grade stainless steel, and head closure 310, constructed so that the unit is capable of withstanding super- atmospheric pressure. Inside the body are first and second thermal exchange conduits 270 and 280 in the form of substantially helical, coaxial, stainless steel alloy tubes (shown best in Figure 3c) .
  • First and second inlets 320 and 330 are for connecting to pipes Pi and P3 respectively, and first and second outlets 340 and 350 are for connecting to pipes P2 and P4 respectively.
  • Apertures 360a and 360b, shown in Figure 3d, are provided respectively to the (water) inlet and outlet pipes 290a and 290b shown in Figure 2.
  • the autoclave vessel 210 In use, during a leaching cycle the autoclave vessel 210 contains caustic leaching fluid at raised temperature and pressure. Typically the pressure inside the autoclave vessel may reach up to 30 bar and the temperature may reach 250C. The pressure is varied to cause the fluid in the tank to boil cyclically, so as to agitate the ceramic cores. At each periodic release of pressure the gas (typically air ⁇ inside the vessel is vented via pipe Pi to the heat exchanger 240.
  • the gas typically air ⁇ inside the vessel is vented via pipe Pi to the heat exchanger 240.
  • the hot, pressurized gas cools as it passes through the conduit 270, due to the conduit being surrounded by cooling fluid, so that when it reaches the tank 220 its energy has been substantially reduced (pressure and temperature have reduced) , Similarly, at the end of a leaching cycle the used leaching fluid is discharged up to a maximum temperature of 250C, and/or up to a maximum pressure of 30 barg, from the vessel 210 through pipe P3 to the heat exchanger 240, where it passes through the conduit 280, thereby cooling it before passing through pipe P4 to the storage tank 220.
  • the temperature in the tank 220 typically ranges between ambient and 60C.
  • Suitable valves are used to replenish the heat exchange medium (ie water) , through inlet 290a and outlet 290b pipes, preferably substantially continuously as it becomes heated through contact with the conduits 270 and 280, so as to maintain the efficiency of the cooling.
  • FIG. 4 shows schematically another embodiment of the present invention.
  • the heat exchanger 240 is used not only to cool the venting gas and the discharged leaching liquid, but is also used to pre-heat the leaching liquid from the tank at the next charging of the autoclave vessel 210.
  • an electric heating device (not shown) , such as a heating blanket around an external surface of the body, that heats the exchange medium surrounding the conduits 270 and 280.
  • the heat exchange unit 240 is rated at super-atmospheric pressure, so as to allow heating to the desired temperature.
  • the leaching fluid passes from the tank 220 along the same path as it does when discharging from the vessel 210 but in reverse, so that it travels first through pipe P4, then through the conduit 270 and then via pipe P3 to the vessel 210.
  • Pre-heating the leaching fluid in this way makes for increased efficiency, since less energy is required to heat the liquid while in the autoclave vessel in order to attain its operating temperature.
  • both the leaching liquid and the pressurizing/venting gas are cooled in the heat exchanger.
  • the liquid and the gas should be conveyed separately between the autoclave vessel and the external support system, such as the tank, it may be sufficient to conduct only one through the heat exchanger. For example, it may be sufficient for only the leaching liquid to be conveyed through the thermal exchange conduit.
  • the heat exchanger is described as being located or interposed between the autoclave vessel and the storage tank, this need not mean that the heat exchanger must occupy physical space between the other two. Rather, the heat exchanger need only be positioned on a flow path between them.
  • the physical juxtaposition of the three vessels may be chosen according to available space and to maximise efficiency.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

An autoclave system comprises an autoclave vessel (210), for performing a leaching operation on sacrificial ceramic cores (not shown) and a storage vessel (220) for containing caustic leaching fluid (230). Interposed in a fluid flow path between the vessel 210 and the tank (220) is a heat exchange unit (240), comprising a body (250) containing a thermal exchange medium, in the form of water (260), and first and second thermal exchange conduits represented at (270) and (280). A thermal exchange medium inlet pipe (290a) and a thermal exchange medium outlet pipe (290b) are provided to the body so that the medium (260) can be replenished, preferably substantially continuously, to optimize thermal transfer efficiency.

Description

Autoclave System and Method
The present invention relates to an autoclave system and to a method of operating an autoclave system, and is concerned particularly, though not exclusively, with a leaching autoclave system and a method of operating the same .
An autoclave is a pressure vessel used in various processes usually requiring the applications of high pressures and/or temperatures to treat physically, and/or chemically, an article such as a component, instrument or workpiece .
In some applications the operation of the autoclave is to cause the dissolution or degradation of sacrificial ceramic structures, known as cores, used in the precision casting of fine components, such as turbine parts for aviation engines, where these cannot be removed from the finished component intact. To achieve this, the component is placed inside an autoclave vessel and a solution that is destructive (usually caustic) to the ceramic core is introduced. Using a combination of pressure and temperature, the caustic solution inside the autoclave is made to boil violently, and thus to agitate, and ultimately dissolve, the ceramic core, in a process known as "leaching". The caustic solution is then discharged to a supply tank so that the component can be removed from the autoclave, before repeating the cycle with a new component, using solution from the tank.
Gas, such as nitrogen or air, is used selectively pressurize the vessel, so as to control the boiling of the leaching solution therein. This is sometimes referred to as the pressurizing or venting gas.
Figure 1 shows schematically, generally at 100, a leaching autoclave system, in which an autoclave vessel
110 communicates fluidically with a storage tank 120.
First and second discharge pipes 130 and 140 respectively convey vented gas and/or vapour and used leaching fluid from the autoclave vessel 110 to the tank 120, at the end of a leaching cycle. A charging pipe 150 conveys leaching fluid from the tank 120 to the vessel 110 in preparation for the next leaching cycle.
The casting techniques and the component structures themselves continue to evolve in complexity, and so the ceramic material used in the core has been developed accordingly. As a result, leaching operations tend towards ever-greater pressures and temperatures. Furthermore, the cycling of increasing and decreasing pressures within the autoclave requires a periodic venting of gas, which may include potentially hazardous entrained vapour. Rapid dissipation of energy into the tank can also be hazardous.
Both the extracted leaching liquid and the vented gas are typically returned to a storage vessel which contains a reservoir volume of the leaching fluid at a lower temperature and pressure. As the returning fluids are introduced into the tank, sometimes through a pressure- dissipating pipe - known as a "sparge pipe", their energy reduces. However, with successive cycles of charging and discharging the autoclave vessel the temperature of the reservoir increases. After a number of cycles, the temperature reaches a level at which a hazard risk is presented.
When seeking to accommodate increased temperatures and pressures in the leaching process it has previously been considered to simply increase the volume of the reservoir. However, as well as being impractical, and undesirable for reasons of space, this approach fails to address another problem, which is that of excessive noise being generated when the fluids are reintroduced to the tank, in part due to the rapid expansion of gas and localized boiling of reservoir liquid.
Embodiments of the present invention aim to address at least partly the aforementioned problems.
The present invention is defined in the attached independent claims, to which reference should now be made. Further, preferred features may be found in the sub-claims appended thereto.
According to one aspect of the present invention, there is provided a heat exchanger for use with an autoclave vessel arranged in use to communicate fluidically with an external support system, the heat exchanger being arranged in use to be located in a fluid flow path between the autoclave vessel and the external support system, and to be fluidically connected to each, the heat exchanger comprising a body and a thermal exchange conduit located within the body arranged in use to convey fluid between the autoclave vessel and the support system, the body being arranged in use to contain a thermal exchange medium for at least partly surrounding the conduit so as to facilitate the transfer of heat energy between fluid in the conduit and the thermal exchange medium outside the conduit in use, wherein a leaching fluid and a pressurizing/venting fluid are arranged to be separately conveyed between the autoclave vessel and the external support system, and at least one of the leaching fluid and the pressurizing/venting fluid is conveyed through the thermal exchange conduit.
Preferably the conduit is arranged in use to convey leaching fluid for use in a leaching operation in an autoclave vessel.
Alternatively or additionally the conduit is arranged in use to convey venting fluid from an autoclave vessel. Accordingly, the conduit may comprise a first conduit pathway arranged in use to convey leaching fluid between an autoclave vessel and an external support system. The conduit may comprise a second conduit pathway arranged in use to convey venting fluid from an autoclave vessel to an external support system. In a preferred arrangement the conduit comprises first and second conduit pathways.
The first conduit pathway is preferably arranged in use to convey leaching fluid discharged from an autoclave vessel to an external support system, and may convey leaching fluid from an external support system to an autoclave vessel. The heat exchanger may comprise a heater for heating the leaching fluid prior to charging of an autoclave vessel, either directly or indirectly via the thermal exchange medium. The external support system may comprise a supply of fluid and/or an outlet for discharged fluid. In a preferred arrangement the external support system comprises a storage tank for storing fluid. The body is preferably constructed so as to withstand super-atmospheric pressure. In a preferred arrangement the body comprises valving to allow control of the thermal transfer medium into and/or out of the body. Preferably the body is arranged in use to contain a thermal transfer medium in the form of a liquid. The thermal transfer medium may comprise water, and more preferably may comprise liquid water. In a preferred arrangement the first conduit pathway and/or the second conduit pathway comprise one or more tubes. The, or each tube may be substantially helical. The or each tube may be in thermal contact with the exchange medium, and more preferably may be at least partly or substantially surrounded by, and/or at least partly or substantially immersed in, the exchange medium.
The invention also includes a leaching autoclave system comprising a heat exchanger according to any statement herein. The system may comprise an autoclave vessel and may comprise an external support system which may include a storage tank, with one or both of the vessel and support system being arranged in fluidic communication with the heat exchanger, which is located separately.
According to another aspect of the present invention, there is provided a method of operating a leaching autoclave system, the method comprising discharging fluid from an autoclave vessel to an external support system through a heat exchanger to reduce the temperature of the fluid, wherein the method comprises conveying separately a leaching fluid and a pressurizing/venting fluid from the autoclave vessel to the external support system, at least one of the leaching fluid and the pressurizing/venting fluid being conveyed through a thermal exchange conduit of the heat exchanger.
The method may comprise passing the discharge fluid through the conduit of the heat exchanger, which conduit is in thermal contact with a thermal transfer medium. The method may comprise passing a first component of discharging fluid through a first conduit pathway to reduce the temperature of the first component, the first component comprising a leaching fluid. Alternatively, or in addition, the method may comprise passing a second component of discharging fluid through a second conduit pathway to reduce the temperature of the second component, the second component comprising pressurizing/venting fluid. The first component of fluid may comprise a liguid component and the second component may comprise a gaseous component. The method may comprise heating a leaching fluid in the heat exchanger prior to charging an autoclave vessel for a leaching operation. The method may comprise heating the leaching fluid by heating a thermal exchange medium of the heat exchanger.
In a preferred arrangement, the method includes charging and discharging the autoclave with leaching fluid through the same conduit, more preferably the same conduit pathway, in the heat exchanger.
The invention may include any combination of the features or limitations referred to herein, except such a combination of features as are mutually exclusive, or mutually inconsistent.
A preferred embodiment of the present invention will now be described, by way of example only, with reference to the accompanying diagrammatic drawings, in which: Figure 1 shows schematically a previously considered leaching autoclave system;
Figure 2 shows schematically a leaching autoclave system according to an embodiment of the present invention;
Figures 3a to 3d show, respectively: in perspective view, in perspective view with a body removed, in sectional view, and in part-cutaway perspective view from above, a heat exchanger for use in the system according to Figure 2; and Figure 4 shows schematically a leaching autoclave system in accordance with another embodiment of the present invention .
Turning to Figure 2, this shows generally at 200 an autoclave system according to an embodiment of the present invention. The system comprises an autoclave vessel 210, for performing a leaching operation on sacrificial ceramic cores (not shown) and a storage vessel 220 for containing caustic leaching fluid 230. Interposed in a fluid flow path between the vessel 210 and the tank 220 is a heat exchange unit 240.
The heat exchange unit 240 comprises a body 250 containing a thermal exchange medium, in the form of water 260, and first and second thermal exchange conduits represented at 270 and 280. A thermal exchange medium inlet pipe 290a and a thermal exchange medium outlet pipe 290b are provided to the body so that the medium 260 can be replenished, preferably substantially continuously, to optimize thermal transfer efficiency.
Pipe PI conveys venting gas from the autoclave vessel 210 to the heat exchanger 240. The venting gas is cooled, and its pressure reduced, in the heat exchanger before being conveyed to the tank 220 by pipe P2.
Used leaching fluid is discharged from the vessel 210 to the heat exchanger via pipe P3r where it is cooled and its pressure reduced before being returned to the tank 220 via pipe P4, at the end of a leaching cycle. The leaching or caustic fluid may typically comprise a base liquid such as an aqueous solution of a hydroxide, more typically sodium or potassium hydroxide.
A further pipe, P5 conveys leaching fluid from the tank to charge the vessel 210 for the next leaching cycle.
Turning now to Figures 3a to 3c, these show the heat exchanger unit 240 in more detail. The unit 240 comprises a substantially cylindrical body 300 of 316 Grade stainless steel, and head closure 310, constructed so that the unit is capable of withstanding super- atmospheric pressure. Inside the body are first and second thermal exchange conduits 270 and 280 in the form of substantially helical, coaxial, stainless steel alloy tubes (shown best in Figure 3c) . First and second inlets 320 and 330 are for connecting to pipes Pi and P3 respectively, and first and second outlets 340 and 350 are for connecting to pipes P2 and P4 respectively.
Apertures 360a and 360b, shown in Figure 3d, are provided respectively to the (water) inlet and outlet pipes 290a and 290b shown in Figure 2.
In use, during a leaching cycle the autoclave vessel 210 contains caustic leaching fluid at raised temperature and pressure. Typically the pressure inside the autoclave vessel may reach up to 30 bar and the temperature may reach 250C. The pressure is varied to cause the fluid in the tank to boil cyclically, so as to agitate the ceramic cores. At each periodic release of pressure the gas (typically air} inside the vessel is vented via pipe Pi to the heat exchanger 240. The hot, pressurized gas cools as it passes through the conduit 270, due to the conduit being surrounded by cooling fluid, so that when it reaches the tank 220 its energy has been substantially reduced (pressure and temperature have reduced) , Similarly, at the end of a leaching cycle the used leaching fluid is discharged up to a maximum temperature of 250C, and/or up to a maximum pressure of 30 barg, from the vessel 210 through pipe P3 to the heat exchanger 240, where it passes through the conduit 280, thereby cooling it before passing through pipe P4 to the storage tank 220. The temperature in the tank 220 typically ranges between ambient and 60C.
The use of the heat exchanger 240, as an intermediary between the autoclave vessel 210 and the storage tank 220 allows the latter to be kept at a modest size whilst still accommodating the returning leaching fluid and the pressurized venting gas. Suitable valves are used to replenish the heat exchange medium (ie water) , through inlet 290a and outlet 290b pipes, preferably substantially continuously as it becomes heated through contact with the conduits 270 and 280, so as to maintain the efficiency of the cooling.
Figure 4 shows schematically another embodiment of the present invention. In this embodiment the heat exchanger 240 is used not only to cool the venting gas and the discharged leaching liquid, but is also used to pre-heat the leaching liquid from the tank at the next charging of the autoclave vessel 210. To achieve the pre-heating the heat exchanger is provided with an electric heating device (not shown) , such as a heating blanket around an external surface of the body, that heats the exchange medium surrounding the conduits 270 and 280. As stated above, the heat exchange unit 240 is rated at super-atmospheric pressure, so as to allow heating to the desired temperature. The leaching fluid passes from the tank 220 along the same path as it does when discharging from the vessel 210 but in reverse, so that it travels first through pipe P4, then through the conduit 270 and then via pipe P3 to the vessel 210.
There is no need for a separate charging pipe, and the arrows indicate a bi-directional flow in pipes P3 and P .
Pre-heating the leaching fluid in this way makes for increased efficiency, since less energy is required to heat the liquid while in the autoclave vessel in order to attain its operating temperature.
In the above described embodiments both the leaching liquid and the pressurizing/venting gas are cooled in the heat exchanger. However, this does not have to be the case. Whilst the liquid and the gas should be conveyed separately between the autoclave vessel and the external support system, such as the tank, it may be sufficient to conduct only one through the heat exchanger. For example, it may be sufficient for only the leaching liquid to be conveyed through the thermal exchange conduit.
It will be understood by the skilled person that where the heat exchanger is described as being located or interposed between the autoclave vessel and the storage tank, this need not mean that the heat exchanger must occupy physical space between the other two. Rather, the heat exchanger need only be positioned on a flow path between them. The physical juxtaposition of the three vessels may be chosen according to available space and to maximise efficiency.
Whilst endeavouring in the foregoing specification to draw attention to those features of the invention believed to be of particular importance, it should be understood that the applicant claims protection in respect of any patentable feature or combination of features referred to herein, and/or shown in the drawings, whether or not particular emphasis has been placed thereon.

Claims
A heat exchanger for use with an autoclave vessel arranged in use to communicate fluidically with an external support system, the heat exchanger being arranged in use to be located in a fluid flow path between the autoclave vessel and the external support system, and to be fluidically connected to each, the heat exchanger comprising a body and a thermal exchange conduit located within the body arranged in use to convey fluid between the autoclave vessel and the support system, the body being arranged in use to contain a thermal exchange medium for at least partly surrounding the conduit so as to facilitate the transfer of heat energy between fluid in the conduit and the thermal exchange medium outside the conduit in use, wherein a leaching fluid and a pressurizing/venting fluid are arranged to be separately conveyed between the autoclave vessel and the external support system, and at least one of the leaching fluid and the pressurizing/venting fluid is conveyed through the thermal exchange conduit.
A heat exchanger according to Claim 1, wherein the conduit is arranged in use to convey leaching fluid for use in a leaching operation in an autoclave vessel .
A heat exchanger according to Claim 1 or Claim 2, wherein the conduit is arranged in use to convey pressurizing/venting fluid from an autoclave vessel. A heat exchanger according to any of the preceding claims, wherein the conduit comprises a first conduit pathway arranged in use to convey leaching fluid between an autoclave vessel and an external support system.
A heat exchanger according to any of the preceding claims, wherein the conduit comprises a second conduit pathway arranged in use to convey venting fluid from an autoclave vessel to an external support system.
In a preferred arrangement the conduit comprises first and second conduit pathways .
A heat exchanger according to Claim 6, wherein the first conduit pathway is arranged in use to convey leaching fluid discharged from an autoclave vessel to an external support system, and may convey leaching fluid from an external support system to an autoclave vessel .
A heat exchanger according to any of the preceding claims, wherein the heat exchanger comprises a heater for heating the leaching fluid prior to charging of an autoclave vessel.
A heat exchanger according to any of the preceding claims, wherein the heat exchanger is arranged to be connected to an external support system comprising a storage tank for storing fluid.
10. A heat exchanger according to any of the preceding claims in which the body is constructed so as to withstand super-atmospheric pressure.
11. A heat exchanger according to any of the preceding claims, wherein the body is arranged in use to contain a thermal transfer medium in the form of a liquid.
12. A leaching autoclave system comprising a heat exchanger according to any of Claims 1-11, further comprising an autoclave vessel fluidically connected to an external support system, with one or both of the vessel and support system being arranged in fluidic communication with the heat exchanger.
13. A method of operating a leaching autoclave system, the method comprising discharging fluid from an autoclave vessel to an external support system through a heat exchanger to reduce the temperature of the fluid, wherein the method comprises conveying separately a leaching fluid and a pressurizing/venting fluid from the autoclave vessel to the external support system, at least one of the leaching fluid and the pressurizing/venting fluid being conveyed through a thermal exchange conduit of the heat exchanger.
14. A method according to Claim 13, wherein the method comprises passing the discharge fluid through the conduit of the heat exchanger, which conduit is in thermal contact with a thermal transfer medium.
15. A method according to Claim 13 or 14, comprising passing a first component of discharge fluid through a first conduit pathway to reduce the temperature of the first component, the first component comprising a leaching fluid.
16. A method according to any of Claims 13-15, wherein the method comprises passing a second component of discharging fluid through a second conduit pathway to reduce the temperature of the second component, the second component comprising a pressurizing/venting fluid .
17. A method according to any of Claims 13-16, wherein the method comprises heating a leaching fluid in the heat exchanger prior to charging an autoclave vessel for a leaching operation.
18 . A method according to any of Claims 13-17, wherein the method includes discharging the autoclave with leaching fluid through a common conduit in the heat exchanger .
EP18735371.9A 2017-05-31 2018-05-30 Autoclave system and method Active EP3630345B1 (en)

Applications Claiming Priority (2)

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GBGB1708641.4A GB201708641D0 (en) 2017-05-31 2017-05-31 Autoclave system and method
PCT/GB2018/051470 WO2018220367A1 (en) 2017-05-31 2018-05-30 Autoclave system and method

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EP3630345B1 EP3630345B1 (en) 2023-07-05

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CN (1) CN110944739A (en)
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EP3630345B1 (en) 2023-07-05
CN110944739A (en) 2020-03-31
GB201808838D0 (en) 2018-07-11
US11666878B2 (en) 2023-06-06
GB2565402A8 (en) 2019-02-20
GB2565402B (en) 2020-06-24
US20200147568A1 (en) 2020-05-14
WO2018220367A1 (en) 2018-12-06
GB201708641D0 (en) 2017-07-12
GB2565402A (en) 2019-02-13

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